The Lanark property is underlain primarily by thin bedded, dark, incompetent slates interbedded with lesser amounts of thinly bedded, dark, argillaceous limestones, of the Lower Cambrian and younger Lardeau Group. The bedding strikes between 320 and 340 degrees and dips from 50 to 60 degrees to the northeast. The limestone is the hostrock for the deposit and has been partly to completely replaced by silica, locally.

Replacement-type quartz veins are mineralized with massive argentiferous galena, sphalerite, pyrite, and minor tetrahedrite and chalcopyrite. Calcite and silicified and crushed limestone wallrock also forms part of the gangue. The veins are often folded, averaging 35 to 45 degree dips to the east-northeast. The veins apparently flatten towards the summit of the mountains. Most of the veins are parallel with the bedding, but also pass from one bedding plane to another.

The mine workings developed a vein about 7.6 metres wide in the upper levels, which decreased to 1.5 metres wide in the lower workings. Two shafts and three adits explored the extension of the Lanark main vein system on the adjoining Maple Leaf claim (Lot 1562).

A channel sample across 0.33 metre of massive galena from a trench in the vicinity of the Lanark shaft analysed 504.9 grams per tonne silver, 15.3 per cent zinc and 11.5 per cent lead. At another location on the property a rock sample analysed up to 3 grams per tonne gold (Assessment Report 21390).

The Lanark claim was staked about 1883. By 1888, an incline shaft was sunk on the vein for 30 metres, with about 152 metres of tunnels completed on the 30 and 122 metre levels, and 91 metres of drifting. Development continued until 1893. The property was re-opened in 1896. All available ore was stoped out and work was suspended prior to 1900. In 1915, more ore was discovered and mined out by 1923. In 1925, all work ceased and the plant dismantled.

The mine comprised adits and raises to a depth of 122 metres and below that by a winze 42 metres deep with a drift at the bottom.